MCP server

Oeis

io.github.cyanheads/oeis-mcp-server

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Identify integer sequences by terms, search the OEIS, read formulas, programs, b-files, cross-refs.

Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

6

Token cost

About 2,469 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http oeis-mcp-server https://oeis.caseyjhand.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.oeis-mcp-server]
url = "https://oeis.caseyjhand.com/mcp"

Gemini CLI

{"mcpServers":{"oeis-mcp-server":{"httpUrl":"https://oeis.caseyjhand.com/mcp"}}}

Cursor

{"mcpServers":{"oeis-mcp-server":{"url":"https://oeis.caseyjhand.com/mcp"}}}

VS Code

{"servers":{"oeis-mcp-server":{"type":"http","url":"https://oeis.caseyjhand.com/mcp"}}}

Antigravity

agy mcp add oeis-mcp-server https://oeis.caseyjhand.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"oeis-mcp-server","server_url":"https://oeis.caseyjhand.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"oeis-mcp-server","server_url":"https://oeis.caseyjhand.com/mcp"}

Tools

• oeis_get_cross_refs ~374 tokens
  List sequences related to an OEIS entry. direction outgoing returns the A-numbers named in the entry's cross-reference (Cf.) lines, with any parenthetical note beside each; direction incoming returns entries that mention this A-number anywhere. Each row carries the related sequence's name and first
• oeis_get_sequence ~627 tokens
  Fetch one OEIS entry by A-number. Returns the name, data-line terms, offset, keywords, author, dates, and the sections: comments, formulas (recurrences and generating functions), examples, programs (Maple, Mathematica, PARI, Python, …), references, links, cross-references, and extensions. When the s
• oeis_get_terms ~437 tokens
  List terms a(n) of a sequence with their indices n. Reads the entry's b-file when it has one — often thousands of terms beyond the data line — and otherwise the data line itself. Values are exact decimal strings of any size. A slice stops at limit terms (at most 1000 per call), at about 100,000 byte
• oeis_identify_sequence ~418 tokens
  Identify integer sequences that contain a run of consecutive terms, e.g. "1, 2, 5, 14, 42". Returns up to 10 matches per page in OEIS relevance order, each with the index n at which the supplied run begins. For the best hit rate supply about 6 terms and leave off the first one or two, since sources
• oeis_list_reference ~208 tokens
  Look up OEIS vocabulary used by the other tools: keyword flags (nonn, core, tabl, cons, …), search syntax (prefixes, operators, wildcards, sort orders, paging window), and identifier conventions (A-numbers, legacy M/N numbers, offsets, b-files).
• oeis_search_sequences ~405 tokens
  Search the OEIS using its query syntax: plain words, "quoted phrases", comma-separated terms, prefixes (keyword:, author:, name:, comment:, formula:, program:, xref:, id:), | for OR, and a leading - to exclude. Returns up to 10 summaries per page. For identifying a sequence from its terms, oeis_iden

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